1/3/2024 0 Comments Charge of carbon nanotubes![]() ![]() NV scanning probes have also few limitations: optical readout introduces a significant challenge at cryogenic temperatures, and using the sensor at high magnetic fields requires impractical RF frequencies. This gives NV center-based probes unprecedented sensitivity to local magnetic fields, and additionally a modest sensitivity to electric fields 7. From all the above techniques, only NV centers utilize a quantum two-level system (qubit) that takes full advantage of the power of quantum manipulations. To date, a large variety of scanning probe sensors have been developed, optimized to measure specific physical quantities: Magnetic fields are primarily imaged via scanning SQUIDs 1, Hall probes 2 and NV centers 3, while electric fields are primarily probed with Kelvin probes 4, scanning tunneling potentiometry 5, and scanning single electron transistors (SET) 6. When used as scanning probes, these detectors provide a unique insight to electronic and spin systems on the nanoscale. Ultrasensitive nanoscale detectors of electric and magnetic fields take an increasingly central role in advancing the research of devices and materials. These features make this atomic-like qubit a powerful tool, enabling a variety of imaging experiments. Due to its simplicity, this qubit can be fabricated using conventional techniques. We demonstrate electric field sensitivity better than that of a single electron transistor, and DC magnetic field sensitivity comparable to that of NV centers. Different magnetic moments and charge distributions of these wavefunctions make it sensitive to magnetic and electric fields, while difference in their electrical transport allows a simple transport-based readout mechanism. Our qubit’s basis states are formed from the natural electronic wavefunctions in a single quantum dot. Here, we demonstrate, in a carbon nanotube, an implementation of a charge qubit that achieves these requirements. However, forming a nano-scale qubit that is simple and robust enough to be placed on a scanning tip, and sensitive enough to detect various physical observables, is still a great challenge. Quantum sensing techniques have been successful in pushing the sensitivity limits in numerous fields, and hold promise for scanning probes that study nano-scale devices and materials. ![]()
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